3a²-[-7-(6a²-4a)]- [-1+(-8a+1)] me simplify the expression by removing grouping symbols and combining like terms. write the terms from highest to the lowest power of the variable i don't know how to do this

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2